JPH10227020A - Floating wave dissipation revetment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the wave dissipation effect of incoming waves in a wide wave-length range by improving the shape and structure of a floating wave dissipation revetment. SOLUTION: Revetment bodies 1 as floats are arranged in parallel to a wave incoming direction and the water-line shape of the revetment bodies 1 is formed into a U-shape so that an inside water surface 5 open to the lower sides of waves can be formed inside. In a wave-length area for incoming waves 2 to greatly oscillate the revetment bodies 1, wave dissipation is performed by the mutual interference of side waves 8 from the revetment bodies 1 and, in the other wave-length area, wave dissipation is performed by the mutual interference of rear end waves 7a, which are going to be turned around the inside water surface 5, with a wave diffraction phenomenon at the rear ends 1d of the revetment bodies 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating breakwater for breaking waves by a floating body moored at sea.

[0002]

2. Description of the Related Art FIG. 3 (plan view) shows an example of a floating breakwater that has been developed in the past. A mooring line 03 and a sinker 04 are used as restraining means arranged along the direction 02 so as to keep the embankments 01 at a constant interval from each other. FIG. 4 is a side view of the embankment body 01. The motion of the embankment body 01, such as pitching 07, occurs as the wavefront 06 changes. With the movement of such embankment 01,
A transverse wave in the wave direction 05 shown in FIG. 3 is generated, and the transverse waves interfere with each other between the adjacent levee bodies 01, whereby the approach direction is changed.
Wave-dissipating action is performed by consuming the energy of waves entering from offshore along 02.

[0003]

By the way, the above-mentioned conventionally developed floating breakwater has a wave-breaking performance in the wavelength region of the entering wave where the movement of the dam body 01, that is, the vertical swing, is greatest. Although it is excellent, it has a disadvantage that the wave canceling effect is small for waves in other wavelength ranges. An object of the present invention is to provide a floating breakwater which solves such a drawback by improving the shape and structure of the embankment body.

[0004]

In order to solve the above-mentioned problems, a floating breakwater according to the present invention has a plurality of levee bodies as floating bodies, and these levee bodies extend in their longitudinal directions in the direction of wave entry. Are arranged substantially in parallel with each other so that the water line shape of each embankment is formed in a U-shape, so that an internal water surface opened to the lower side of the wave is formed inside the embankment. It is characterized by:

In the above-described floating breakwater of the present invention, in the wavelength region of the entering wave in which each levee body largely oscillates, the transverse waves generated from each levee body interfere with each other to cancel each other, and in the other wavelength regions, the respective transverse waves break. At the rear end of the levee body, rear-end waves that try to sneak into the internal water surface due to wave diffraction phenomena are generated and interfere with each other to perform a wave-eliminating action. Therefore, the wave canceling effect can be accurately performed over a wide range of the wavelength range of the incoming wave.

Further, left and right body portions that define both sides of the inner water surface of the embankment body are connected to each other at lower end portions by flat bottoms, and the bottom portions define the lower side of the inner water surface. In this case, since the internal water surface is in a state of sufficient hydrostatic water, it is appropriate to generate a trailing wave that tries to sneak into the internal water surface of each embankment when the incoming wave arrives at the embankment As a result, mutual interference between the left and right rear end waves in each levee body is sufficiently performed, and a high wave-elimination effect can be obtained.

[0007] Further, in the case where a wave-absorbing member is provided on the inner end wall of the embankment which divides the inner part of the inner water surface,
As described above, when the incoming waves wrap around at the rear end of each embankment and interfere with each other, and when the remaining waves enter the internal water surface,
Since the wave is eliminated by the wave-eliminating member at the inner part of the inner water surface, the wave-eliminating action on the incoming wave is sufficiently performed as a whole.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a floating breakwater according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG.

As shown in FIG. 1, the floating breakwater of the present embodiment also has a levee body 1 as a floating body, and these levee bodies 1 have their longitudinal directions along the approach direction 3 of the approaching wave 2. And they are moored to the seabed by mooring lines 4. The water line shape of each levee body 1 is formed in a U-shape, so that an inner water surface 5 that opens to the lower side of the wave is formed inside the levee body 1.

Further, as shown in FIG. 2, left and right body portions 1a, 1a defining both sides of the internal water surface 5 of the embankment body 1 have lower end portions of the body portions 1a, 1a formed by mutually flat bottom portions 1b. And the bottom 1b is thus connected to the inner water surface 5
Divides the lower side.

Further, as shown in FIG. 1, the inner end wall 1c of the embankment body 1 that defines the inner part of the inner water surface 5 has a wave-dissipating member formed of a wire mesh, a number of small projecting plates, a perforated plate, or the like. 6
Is provided.

In the above-described floating breakwater according to the present embodiment, in the wavelength region of the incoming wave 2 in which each levee body 1 largely oscillates, the transverse waves 7 generated from each levee body 1 interfere with each other and cancel each other. In the wavelength region of the above, at the rear end 1d of each embankment body 1, the rear end waves 7a which try to wrap around the internal water surface 5 due to the wave diffraction phenomenon are generated, interfere with each other, and the wave canceling action is performed. Accordingly, the wave canceling effect can be accurately performed over a wide range of the wavelength range of the incoming wave 2.

The lower body 1a, 1a, which divides both sides of the inner water surface 5 of the embankment body 1, is connected at its lower end with a bottom 1b, so that the lower side of the inner water surface 5 is lower. Since the inner water surface 5 is partitioned, the inner water surface 5 is in a state of a sufficient hydrostatic surface, so that when the incoming wave 2 arrives, the generation of the rear end wave 7a which tries to go around the inner water surface 5 of each embankment body 1 is generated. Properly done. In this way, the left and right rear-end waves 7a in each bank 1 are sufficiently interfered with each other, and a high wave-elimination effect can be obtained.

Further, since the wave-absorbing member 6 is provided in the inner part of the inner water surface 5, the incoming waves 7a wrap around and interfere with each other at the rear end 1d of each embankment body 1 as described above. When the remaining wave enters the internal water surface 5, the wave is sufficiently eliminated by the wave-eliminating member 6 inside the internal water surface 5. In this way,
The wave canceling action for the incoming wave 2 is sufficiently performed.

[0015]

As described above, according to the floating breakwater of the present invention, the following effects can be obtained. (1) In the wavelength region of the incoming wave where each levee body shakes greatly, the transverse waves generated from each levee body interfere with each other and cancel each other, and in other wavelength regions, the wave diffraction phenomenon occurs at the rear end of each levee body. The rear-end waves that try to wrap around the internal water surface are generated and interfere with each other to perform the wave-dissipating action. Therefore, the wave canceling effect can be accurately performed over a wide range of the wavelength range of the incoming wave. (2) The left and right trunks that divide both sides of the inner water surface of the embankment body are connected to each other at the lower ends of the trunks by flat bottoms, and the bottoms divide the lower side of the inner water surface. And, since the internal water surface is in a state of sufficient hydrostatic surface, when the approach wave of the embankment arrives, the generation of the rear-end wave which tries to sneak into the internal water surface of each embankment is performed appropriately. Thus, interference between the right and left rear end waves in each levee body is sufficiently performed, and a high wave-elimination effect can be obtained. (3) If a wave-dissipating member is provided on the inner end wall of the embankment that divides the inner part of the inner water surface, as described above, the incoming wave wraps around at the rear end of each embankment and interferes. When the remaining wave enters the internal water surface, the wave is eliminated by the wave-dissipating member at the inner part of the internal water surface, so that the wave-inhibiting action on the incoming wave is sufficiently performed as a whole. become.

[Brief description of the drawings]

FIG. 1 is a plan view showing a floating breakwater as an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view showing an example of a conventional floating breakwater.

FIG. 4 is a side view of an embankment body in the floating breakwater of FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 embankment body 1a trunk 1b bottom 1c inner end wall 1d embankment rear end 2 incoming wave 3 wave approaching direction 4 mooring line 5 internal water surface 6 wave-dissipating member 7 lateral wave 7a rear end wave

Claims (3)

[Claims] A plurality of embankments are provided as floating bodies, and these embankments are arranged substantially parallel to each other so that their longitudinal directions are along the direction of wave entry, and the water line shape of each embankment is provided. Is formed in a U-shape, thereby forming an internal water surface that opens downward on the inside of the embankment body. 2. The floating breakwater according to claim 1, wherein the left and right trunks defining both sides of the inner water surface of the embankment are connected at their lower end portions by a flat bottom. A floating breakwater, characterized in that the bottom part defines the lower side of the internal water surface. 3. The floating breakwater according to claim 1, wherein a wave-breaking member is provided on an inner end wall of the levee body that defines an inner part of the inner water surface. , Floating breakwater.